SEAL-WIPER 3901271 - Caterpillar

Harness Wire Identification
Caterpillar identifies different wires with eleven different solid colors. Table 1 lists the color codes of the wiring.
Table 1
Color Codes for Wiring    
Code     Color    
BK     Black    
BR     Brown    
BU     Blue    
GN     Green    
GY     Gray    
OR     Orange    
PK     Pink    
PU     Purple    
RD     Red    
WH     White    
YL     Yellow    In addition to the color, the entire length of each wire is stamped with a specific circuit number that is repeated on every 25 mm (1 inch) of the wire. The actual wires are identified on the schematic.For example, a code of J011-RD on the schematic identifies a red wire that is stamped with the circuit number J011. This particular wire is the engine harness wire for the primary signal of the transformer in the number one cylinder. For all Caterpillar engine harnesses with electronic ignition systems, the code of "J011-RD" identifies the wire for the primary signal of the transformer in the number one cylinder.The schematic also identifies the size of the wire. The size or gauge of the wire is called the American Wire Gauge (AWG). Unless the schematic specifies a different size, you may assume that the wire is 16 AWG.Junction Box
Illustration 1 g01047291
Typical terminal box (1) Junction box (2) Connector for the electronic service toolA junction box (1) may be mounted on the engine. The junction box contains terminal strips and additional components.Remote Control Panels
Some engines are configured with a remote control panel. The location of the panel depends on the customer's requirements.Engine Supervisory System
Illustration 2 g01047293
(2) Connector for the electronic service tool (3) Engine Supervisory SystemThe remote control panel for the Engine Supervisory System (3) contains the Electronic Control Module (ECM) for the air/fuel ratio control and the Status Control Module (SCM).Remote Control Panel (Status)
Illustration 3 g01047294
(2) Connector for the electronic service tool (4) Remote Control Panel (Status)This remote control panel contains only the SCM.